Which of the following statement is correct?

Options

A. `Fe^(2+)` gives brown colour with ammonium thiocyanate
B. `Fe^(2+)` gives blue precipitate with potassium ferricyanide
C. `Fe^(3+)` gives brwon colour with potassium ferrocyanide
D. `Fe^(3+)` gives red colour with potassium ferrocyanide

Answer

To solve the question regarding the correct statements about the reactions involving iron (Fe) ions and thiocyanate or ferrocyanide, we will analyze each option step by step.

### Step 1: Analyze the first statement
**Statement**: Brown color with Ammonium Thiocyanide (NH4SCN) and Fe²⁺.

- When Fe²⁺ reacts with ammonium thiocyanide, it forms a complex that is typically colorless. Therefore, this statement is incorrect.

### Step 2: Analyze the second statement
**Statement**: Fe²⁺ gives a blue color precipitate with potassium ferricyanide (K₃[Fe(CN)₆]).

- When Fe²⁺ reacts with potassium ferricyanide, it forms a blue precipitate known as Turnbull's blue (Fe₃[Fe(CN)₆]₂). Therefore, this statement is correct.

### Step 3: Analyze the third statement
**Statement**: Fe³⁺ gives a brown color with potassium ferrocyanide (K₄[Fe(CN)₆]).

- When Fe³⁺ reacts with potassium ferrocyanide, it forms a brown precipitate known as Prussian brown (Fe₃[Fe(CN)₆]₂). Therefore, this statement is correct.

### Step 4: Analyze the fourth statement
**Statement**: Fe²⁺ gives a red color with potassium ferrocyanide (K₄[Fe(CN)₆]).

- When Fe²⁺ reacts with potassium ferrocyanide, it forms a blue precipitate (Turnbull's blue), not a red color. Therefore, this statement is incorrect.

### Conclusion
The correct statements are:
- **Option 2**: Fe²⁺ gives a blue color precipitate with potassium ferricyanide.
- **Option 3**: Fe³⁺ gives a brown color with potassium ferrocyanide.

### Final Answer
The correct statements are Option 2 and Option 3.

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